Plasma formation and equilibrium in a high. beta. tokamak
The formation and equilibrium of a high ..beta.. tokamak in the Columbia High Beta Tokamak (HBT) (Plasma Physics and Controlled Nuclear Fusion Research 1986, in press) is documented using magnetic probes as the principle diagnostic. The formation from a toriodal field stabilized Z pinch is simulated with 2-D resistive magnetohydrodynamic (MHD) equations. From the measurement of the magnetic field by high-impedence internal magnetic probes, the poloidal flux, toroidal current, and safety factor are calculated. In addition, the plasma position and cross-sectional shape are determined. The tokamak has a major radius of about 0.24 m, a minor radius of about 0.05 m, and a toroidal current density of about 10/sup 6/ A/m/sup 2/. The high ..beta.. tokamak plasma is observed to have an outward shift in major radius of both the magnetic center and the peak of the toroidal current density. The magnetic center moves inward in major radius after 20--30 ..mu..sec, presumably because the plasma maintains major radial equilibrium as its pressure decreases because of the radiation of impurity atoms.
- Research Organization:
- Department of Applied Physics and Nuclear Engineering, Columbia University, New York, New York 10027
- OSTI ID:
- 6345244
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 30:8; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
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700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CLOSED PLASMA DEVICES
EQUILIBRIUM
HIGH-BETA PLASMA
MAGNETIC PROBES
PLASMA
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PROBES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES